Adjustable firearm sight



33-257. 01 2 294949163 5R SEARUF'ERWM Jan. 10, 1950 G. F. DAVIS 2,494,163

ADJUSTABLE FIREARM SIGHT Filed April 2, 1947 2 Sheets-Sheet l mm; mm

2 Sheets-Sheet 2 Filed April 2, 1947 J Wu onto o G g E'Da ms.

fi J v P 2 a u E x z M Q v .3 a V a a 6 7 3 id M v 2 7 2 9 6 x n 4 4 s5 5 u m s 4 IIIIL m 4 u w a .r nl 2 4 L. 5 41 2 Q 7 28 i L 7 6 2 -13 M... 8 n I. ll V2 lu NM lid Ill 2 |H| 9 2 f 7 l 2 a 2 g a Patented Jan. 10, 1950 UNITED STATES PATENTFOFFICE George F. Davis, New Haven, Conn. Application April 2, 1942, Serial No. 738,862

14 Claims.

This invention relates to improvements in adjustable firearm sights and more particularly to a rear sight of new and improved structure particularly for use with the automatic pistols having a retractible slide upon which the sight is mounted, although this invention is not limited to such specific use.

One object of this invention is to provide a firearm sight of new and improved structure whereby it will be particularly adapted for use on a retractible firearm part.

Another object is to provide in a sight of the above nature an improved form of elevation adjusting means.

Still another object is to provide in a sight of the above nature an improved form of windage adjusting means. ,7

A further object is to provide an j improved adjustable firearm sight which will be relatively inexpensive to manufacture, simple and ru ed in construction, compact, ornamental in appearance, and very eflicient and durable in use.

With these and other objects in view, which will appear as the description proceeds, there has been illustrated in the accompanying drawings, a form of adjustable firearm sight in which the features and principles of this invention may be conveniently embodied in practice.

In the drawings:

Figure 1 is a side view of a firearm part with an adjustable sight having the features and principles of this invention embodied in its structure.

Figure 2 is an enlarged rear view, of the sight;

Figure 3 is an enlarged top plan view of the sight;

Figure 4 is an enlarged sectional view taken on the line 4-4 of Figure 3;

Figure 5 is a sectional view taken on the line 5-5 of Figure 3;

Figure 6 is a sectional view taken on the line 6-6 of Figure 3; and t Figure 7 is a sectional view taken on the line 1-1 of Figure 3.

)Referring now to the drawings wherein like reference numerals designate like parts throughout the several views, the numeral M denotes a firearm part, in this instance the slide of an automatic pistol which reciprocates upon the firearm at the firing of each cartridge. The firearm slide II is provided with a suitable transverse groove l2 in which the base 3 of the sight of this invention may be forced to rigidly secure itv thereto. The undersurface I4 of the sight base 3 and the upper surface l5 of the firearm part I I are in close engagement to insure rigidity of assembly.

I The sight base I3 is of one piece of material and has a central groove l6 formed therein and which extends the length thereof whereby side flanges I1 and I8 are provided, one on each side l v 2 of the sight. A sight leaf |9 having a tongue portion 2| and a crosswise extending rear flange portion 22 is disposed with its tongue portion 2| in the groove l6 of thebase l3, the tongue portion 2| being of less width than the groove I6. A transverse hinge/ pin 23 extends through the flanges l1 and |8of the base |3 through the sight leaftongue 2|. The pin 23 has a head 24, which is journaled in a counterbore 22 in the base flange H}, a .threaded portion 25, which is screw threaded through the leaf tongue 2|, and a stem portion 26; which is journaled in the base flange H. A coiled spring 21 reacts between the inner side of the base flange Hi, and the leaf tongue 2| in a counterbore' 28 provided therein to receive the spring, to maintain close contact between the cooperating threads in the leaf tongue 2| and the threaded pin portion 25.

The head 24, of the pin, 23, is provided with an annular groove 29 intermediate its ends, the

ment of its sides with the shank 33 to hold it firmly in place against the upper surface I5 of the firearm slide When pressed inwardlyagainst the fiat bottom surfaces 3| of thegroove 29 in the pin head 24, the rod 32 acts to lock the pin 23 in place and to resist any tendency for the'pin 23 to move transversely. from the base flanges I1 and |8-. The rod 32 also resiliently engages the fiat surfaces 3| of the pin 23 at the bottom of the groove 29 in the pin head'24 to' releasably retain the pin 23 from rotating; The pin head 24 is provided with a cross-slot 36 by which the pin 23 v the rod 32 by'means of-ascrew driver.

may be rotated against'the restraining action of Rotation of the pin23 in the proper direction will cause the leaf |9to be adjusted transversely of the sight basef|3, --and--the *firearm slide H, for 'winda'ge adjustment of thesight (see'dotted lines in Figure 7) aquarter turn of the pin 23 being indicatedwhen as the rod 32'drops into position against the next 'flat surface 3| (see dotted lines in Figure -6). Theopening 34 is of larger diameter than the rod" 32 to allow movement thereof in the groove 29.'

Therod 32 is "constantly and resiliently urged into thegroove 29 and against the flat surfaces 3| by a coiled spring 31 disposed in an opening 38 provided in the base flange l8. The opening 38 extends from the rear end of the base flange l8 and intersects the upper end of the opening 94 to insure that the spring 31 will freely engage the rod 32. The spring 31 reacts between the rod 32 and a plunger 39 slidably disposed in the opening 38 with its outer rounded end 4| in engagement with a lateral extension 42 of the cross flange portion-.22 ofthe sight leaf l9. A similar plunger 43,1slidably disposed in anfopening 44 in the base flange II, has its rounded end 45 resiliently forced against a lateral extension 46 of the cross flange portion 22 of the sight leaf l9 by a coiled spring 48 reacting between the plunger 43 and the flange l 'l at the bottom of the opening 44. The springs 31 and 48 are so tensioned that equal pressure is maintained upon the leaf flange extensions 42 and 46 to obviate any cramping of the leaf l9 on the threaded poftion 25 of the pin 23.

(Ihe plungers 39 and 43 engage the respective flange, extensions 42 and 46,-onsurfaces 49 and respectively- The surfaces 49 and 5| are in transverse alignment and extend upwardly and outwardly; in'=v this instance rearwardly of the sight, on;-1an=.angle toa vertical lineat right angles to the lower surface l4 of the-base I3, Acting downwardly against'the rearwardly and upwardly inclined surfaces 49 and- 5| the spring pressed .plungers 39 and 43 constantly urge the sight leaf l9 downwardly and maintain it in any of its vertical adjustments. In this instance, the surfaces, 49 and 5| are shown recessed in the leaf flange extensions 42 and 46 respectively.

The leaf I9 is arranged to be adjusted vertically by means of an adjusting screw 52 which is screw threaded in a threaded opening 53 extending lengthwise through the leaf flange portion 22 and into the tongue portion 2| of the sight leaf l9. The forward end of the opening 53 opens through the unde'rsideof the leaf tongue portion 2| to permit the forward end 54 of the screw 52 to engage the base '13. The forward end 54 of the screw 52, in this instance, is in the form of a square in cross section providing four straight edges 55, adjacent edges being at right angles to each other. The surface 56, of the base l3, engaged by the edges 55 extends forwardly and upwardly from the rear end of the base I3 at an angle toa horizontal line parallel to the lower surface I4 of the base l3. As the screw 52 is rotated the squared end 54 rides up along the inclined surface 56 to raise, or to permit the lowering of, the rear end of the sight leaf l9 (see dotted in Figure 4) .a quarter tuff of the screw 52 being indicated by the dropping of a flat edge against the surface 56. A slot 51 is provided in the outer end of the screw 52 to receive the end of a' screw driver for rotating the screw. The

sight leaf l 9 pivots on the pin 23 .and has a sightingmotch flffformeratfthe approximate center of the upper surface of the leaf, flange 22.

The construction of a firearm sight as above disclosedv will provide one of rigid structure which is capable of vertical and windage adjustment in an efficient-manner. --The ,provision in. such a. sight of readily formed partsmaintains:

its cost at, a minimum. The arrangement of be understood that the novel features and principles of this invention may be embodied in other specific forms without departing from the spirit and essential attributes thereof, and it is therefore desired that the present embodiment be considered in all respects as illustrative, and not restrictive, reference being had to the claims rather than to the foregoing description to indicate the scope of the invention.

Having thus fully disclosed the invention, what is claimed as new and for which it is desired to secure Letters Patent, is:

1. In a firearm sight, a base, a leaf, a pin extending transversely across said base and upon which one end of said leaf is hinged, upwardly and outwardly transversely spaced inclined surfaces on said leaf, and a spring pressed plunger carried by said base and engaging each of said inclined surfaces on said leaf to constantly urge said leaf downwardly toward said base.

2. In a firearm sight, a base, a leaf, a pin extending transversely across said base and upon which one end of said leaf is hinged, upwardly and outwardly transversely spaced inclined surfaces on said leaf, and a spring pressed plunger carried by said base and engaging each of said inclined surfaces on said leaf to constantly urge said leaf downwardly toward said base, said leaf 1 hinge pin being screw threaded through said leaf,

movement, and a spring reacting between said member and one of the plungers to maintain said member in engagement with said pin and the plunger against an inclined surface of the leaf.

3. In a firearm sight, a base having spaced v apart side flanges, a leaf having a tongue disposed between said base side flanges, a pin ex-' tending between said flanges and being screw threaded to and through said leaf tongue, a member adapted to engage said pin to releasably retain it against turning, an upwardly and outwardly inclined. surface on said leaf, a plunger carried by said base and adapted to engage the inclined surface on said leaf to urge the leaf downwardly, and a spring reacting between said member and said plunger to resiliently act against each to press the former against the pin and the latter against the inclined surface.

4. In a firearm sight, a base having spaced apart side flanges, a leaf having a tongue disposed between said base side flanges, a pin extending between said flanges and being screw threaded to and through said leaf tongue, a flat surface on said pin, a member adapted to engage the said flat surface to releasably retain the pin against said leaf to urge the leaf downwardly, and a spring reacting between said member and said plunger to resiliently act against each to press the various parts and of the controlling springs 'fthe former against the 'pin and the latter against the inclined surface.

5. In a firearm sight, a base, a leaf, a pin excarried by said base and engaging each of said inclined surfaces on said leaf to constantly urge said leaf downwardly toward said base, an. ad-

' justing screw extending inwardly into said leaf from the rear face thereof, and a forwardly and inclinedlsurfaceon said base in position to be ,engagedby said adjusting screw to yerticallytadjust, said leaf.

6, In a firearmsight, a base, a leaf, a pin extend gjtransversely across said base and upon which -onen endi of said leaf is hinged, upwardly and outwardlytransversely spaced inclined surfaces on, said leaf,- and a spring pressed plunger carried by said base and engaging each of said med. surfaces ,ont said leaf to constantly urge sald ileaf downwardly toward said base, said leaf ablein re'spect'tQthebase to pivot the member for swinging movement away from said pin, and a spring reacting between said member and one of said plungers to maintain said member in engagement with said pin and the plunger against the inclined surface of the leaf.

7. A firearm sight including, a base, a leaf, a pin extending transversely of the base and screw threaded through the front end of said leaf to adjust the leaf transversely in respect to the base and upon which the leaf is pivoted for vertical swinging movement, a screw member screw threaded in and extending forwardly from the rear end of said leaf, a forwardly and upwardly inclined surface on said base disposed to be engaged by said screw member to vertically adjust said leaf in respect to said base, and means to resiliently urge said leaf downwardly toward said base.

8. A firearm sight in accordance with claim 7 and in which the pin, upon which the leaf is pivoted, is provided with a flat surface, and a spring pressed member adapted to swing toward and into engagement with the fiat surface on said pin to releasably retain it against turning.

9. A firearm sight in accordance with claim 7 and in which the means to resiliently urge said leaf downwardly toward said base includes a spring pressed plunger, and an upwardly and rearwardly inclined surface on said leaf positioned to be engaged by said plunger.

10. A firearm sight in accordance with claim 7 and in which the screw member in said leaf is provided with a square end in engagement with the inclined surface of the base to releasably retain the screw member against turning.

11. A firearm sight including, a base, a leaf, a pin extending transversely of the base and screw threaded through the front end of said leaf to adjust the leaf transversely in respect to the base and upon which the leaf is pivoted for vertical swinging movement, a screw member screw threaded in and extending forwardly from the rear end of said leaf, 9. forwardly and upwardly inclined surface on said base disposed to be engaged by said screw member to vertically adjust said leaf in respect to said base, said pin having a fiat surface thereon extending crosswise thereof, a member swingably mounted in respect to said base toward and into engagement with the said fiat surface to releasably retain the pin against rotation, a plunger slidable in said base toward said leaf, an upwardly and rearwardly inclined surface on said leaf disposed to be engaged by said plunger to urge the leaf downwardly toward said base, and a spring reacting between said swingable member and said plunger to urge the former into engagement with the pin and the latter against the leaf.

12. In a firearm sight, a base, a leaf, a pin extending transversely across said base and upon which an end of said leaf is pivoted, means to constantly urge said leaf downwardly upon said base including, an upwardly and rearwardly inclined surface on the other end of said leaf, and a spring pressed plunger carried by-said base and having one of its ends engaging-said inclined surface on said leaf.

13. In a firearm sight, a base, a leaf, a pin extending transversely across said base with its intermediate portion extending through and screw threaded to an end of said leaf, said pin having a head portion in engagement with said base, spring means reacting between said base and said leaf to maintain the pin head in close contact with said base and the screw threads in close contact with said leaf, and means to urge the other end of said leaf downwardly toward said base.

14. In a firearm sight, a base, a leaf, a pin extending transversely across said base with its intermediate portion extending through and screw threaded to an end of said leaf, said pin having a head portion in engagement with said base, spring means reacting between said base and said leaf to maintain the pin head portion in close contact with said base and the screw threads in close contact with said leaf, said pin head having a flat surface on its periphery, and a spring pressed member mounted in the base and adapted to engage the fiat surface on said pin to releasably hold it against turning in the base and in the leaf, and means to urge the other end of said leaf downwardly toward said base.

GEORGE F. DAVIS.

REFERENCES CITED UNITED STATES PATENTS Name Date Davis Mar. 30, 1948 Number 

